But please also make sure not to expose your face to the snake, getting tagged in the eye isn't pleasant.
At 3 ft, you should be able to work with it and hopefully get it to calm down. Patience and calmness is key when working with animals.
Good luck, and if it seems that it will not calm down for you, and continues to grow, please do not hesitate to find someone more experianced with giants to take it. The "pride goeth before a fall" is never more applicable when involving giants. We do not need more keepers getting bitten/injured by giants in the news just because you didn't want to admit you couldn't handle it.
I hope that some of the experianced giant keepers here can give you more advice, and that you can calm her down for handling.
Wolfy